alpine docker root password

Going through alpine:3.1 to alpine:3.9, then alpine:edge, I see that the following versions have the problem: 3.3, 3.4, 3.5, and 3.8. I'd suggest a better solution is to give the --add-host NAME:IP argument to docker run when starting the container. Is there anything a dual bevel mitre saw can do that a table saw can not? How to mount a host directory in a Docker container. If you are still using the container you can use exit command to get back to root (default user) user instead of running the container again. Hmm? We prevent cyberattacks. How is Docker different from a virtual machine? > Id think that a few megabytes of disk isnt as valuable as the extra cpu cycles. I think GP is probably thinking of kerberos/NSS, which has a plugin system that requires dynamic linking. while( s[i] != '\0') Some people want to run a huge number of containers and each isnt compute intensive. Some will terminate TLS at ingress and convert to mTLS internally. Issue the command: You should see that the root password is hashed (Figure B). Web-facing systems are facing the greatest risks, but internal systems shouldn't be ignored either. A fixed Alpine image has this root record: First, we recommend that you update your Alpine-based images to the latest release. Necessary cookies are absolutely essential for the website to function properly. I believe I've seen that in the past. If you believe that amazon are potentially an adversary, but you still want to host it on their servers, there is essentially nothing you can do to stop them getting at your data. Although this isnt typical, you might want your containers to deploy with a heightened sense of security. Exactly. * musl prioritizes thread safety and static linking over performance Although not the point of the results [1], they show a decent speed up when using Debian vs Alpine as well. Amir co-founded Aqua with the vision of creating a security solution that will be simpler and lighter than traditional security products. Or to put another way, under what condition is this actually helpful defense in depth? Amir has 20 years of security software experience in technical leadership positions. Also, has anyone reported this to the official Alpine repository? IDEs are essential tools for software development. Add to that that modern Ubuntu uses systemd which greatly exhausts the systems inotify limits, so running 3-4 Ubuntu-containers can easily kill a systems ability to use inotify at all, across containers and the host system. So while the application inside is more secure, using docker is insecure. I have not heard this before. The small size of an image can be an actual issue. 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Multiplied by a thousand containers, and much larger layers on build servers, plus bandwidth, it makes a difference. its one thing to have a backdoor inside a server that they rent to you that would have to be actively exploited and another to passively clone the traffic and analyze it in the name of making the service better. It is also the second search result returned when searching Linux on Docker Hub. then you look at: https://sourceware.org/git/?p=glibc.git;a=blob;f=string/strl and your mind will sort of explode for a bit. Last time I checked, mTLS incurred significant performance penalties and required significant soak testing to ensure that performance would be acceptable for a given application. Exit out of that container, and you are now ready to start rolling out other containers, based on your newly changed CentOS image. They mentally multiply, without realising that each of these will be pulled once for each image built on top of them. Already on GitHub? not necessarily. Alpine Linux docker image has default root credentials with an empty or null password when it utilizes linux-pam or mechanisms which rely on system shadow file as an authentication database. Ubuntu is 40MB but if you add a few packages with tons of dependencies it can quickly reach 800MB. However, use of sudo or other suid binaries is entirely pointless in an alpine container. Any non-root user who is logged into the system can elevate their privileges to root within the container. It will now work. Due to these optimized features, Alpine Linux behaves as a great docker container. EDIT Testing is hard, and ensuring you meet the requirements but keeping it readable can be harder. But things like redis or nginx work nicely with alpine as a base. An image, whose /etc/shadow has a null root user, fails the custom compliance check:(This screenshot was taken on an Alpine:3.9 image before it was fixed.). We also use third-party cookies that help us analyze and understand how you use this website. I guess if you use microservices, most components won't need it; I mostly use monoliths. Containers that are based on the vulnerable Alpine image and have applications that utilize Linux PAM, or some other mechanism which uses the system shadow file as an authentication database, may accept a NULL password for the root user. Create a script that checks for the CVE-2019-5021 vulnerability: 1. 2022 TechOverflow. Some of the answers above were good, especially those like: where you get your CONTAINERID from the first column of the answer to: This makes you root, and you can do anything you want. The difference is the GLIBC version is dramatically faster; take the comments away and most of us wouldn't even know that's strlen. This vulnerability, assigned with CVE-2019-5021, was actually found and patched in the year 2015. I'm trying the su command, but I'm asked to enter the root password. For security researchers and system administrators tracking vulnerabilities via CVE identifiers, this flaw's identifier is CVE-2019-5021. Learn about the new features available with iOS 16, and how to download and install the latest version of Apples mobile operating system. I don't work for Google. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. But I didn't want to rebuild a new image as the previous answers suggest. Although if you havent added any suid binaries by accident then theres no way to go back. A security vulnerability has been discovered in Alpine Linux docker image(since v3.3). <=3.5 is no longer supported. This website uses cookies to improve your experience while you navigate through the website. qsort and memcpy are non-obvious to many folks. Username must be unique. The base image may be small, but all the packages and metadata are large, and the dependencies are many. Why? By registering, you agree to the Terms of Use and acknowledge the data practices outlined in the Privacy Policy. Scan an image. https://talosintelligence.com/vulnerability_reports/TALOS-20 That issue is claimed to have been fixed, with a reference to a commit of the updated images, says issue 430 is a security issue and closed, but no link to the actual fix. su -l myUser Subscribe to our newsletter and get the latest updates. alpinelinux/docker-alpine#13. However, root in a container does have many privileges dropped and seccomp policies applied (assuming you haven't turned seccomp off via k8s). If you are running as a non-privileged user inside a container, which breakouts do you think can be used to escalate privileges to the hosting machine? And a shitty library at the heart that makes everything suck just a bit more. Nothing should be able to login locally to an Alpine container. Docker also has support for user namespaces which makes it so that the root inside the container is e.g. Just run the process. Larger organizations can afford to appoint SREs who can institute a broad range of security and optimization policies (including "all apps should use the same Alpine base image version") and enforce them programmatically as well as ensure that apps are continually updated to match them. Although thats not great either. @karianna I think this issue can be closed as not valid. Let whatever is managing your container restart it if the process quits, be it docker or K8s. So if you're not using a container running ssh/etc, it doesn't affect you. By clicking continue, you agree to these updated terms. You can SSH in to docker container as root by using, Make sure sudo is installed check by entering, If you want to give sudo permissions for user dev you can add user dev to sudo group. How to install PowerShell Core on top of a SQL Server docker image? The downside of plumbing directly to the container is that you lose many of the routing features of a service mesh. How to change a root password in a Docker image. If your binary is static, why do you need a container at all? So I need to be root. We recently updated our When that completes, you can issue the cat /etc/shadow | grep root command to see the root user now has a hashed password. >"Its awesome that the images are pretty small, but a wide variety of software has been shown to run noticeably slower on Alpine compared to other distributions, in part due to its usage of musl instead of glibc". Because it's tiny, I tend to default to Alpine and then move away from it where necessary. Terms and Conditions for TechRepublic Premium. That kind of thing is expensive, resource-wise, for smaller organizations. Retbleed: Intel and AMD Processors Information Disclosure Vulnerability. Correct. I wouldn't be too concerned about that in a container since you're probably not running systemd in that context. Depends on your workload, of course. In order to login, just enter the usernameroot and pressreturn. Then only upper layers will have to be pushed. It's more complex, no question, but it's much faster. Isn't it pretty trivial for a hypervisor to "passively clone" data right out of the memory of the VM? It's much simpler and more oriented towards POSIX compatibility than performance. Well occasionally send you account related emails. Password must be a minimum of 6 characters and have any 3 of the 4 items: a number (0 through 9), a special character (such as !, $, #, %), an uppercase character (A through Z) or a lowercase (a through z) character (no spaces). the application running in the container provides a shell to users). Aqua Security is the largest pure-play cloud native security company, providing customers the freedom to innovate and accelerate their digital transformations. Most Ubuntu-based Docker containers are not running full init. End-to-end encryption is extremely easy to set up and maintain. It has a special format in which each line has the user name and fields (separated by a colon) that specifies information about the password, such as the encrypted password, change time, and expiration time. Why does the United States openly acknowledge targeted assassinations? It means the host is protected from privilege escalation in the container. The NUL character is not allowed in a Linux password. All fields are required. > 2019-03-01 - It was discovered that this issue was also reported and made public in their Github prior to our report, but was not flagged as a security issue and thus remained unresolved until it was rediscovered and reported by Cisco. I have always been a bit surprised at the popularity of Alpine Linux for docker images. Amazed more people don't know this. So when I talk about openssl in the image, I was referring to the `base` flavor. to your account, Provide an Alpine Image with an root password, https://www.zdnet.com/article/alpine-linux-docker-images-ship-a-root-account-with-no-password/ Alternatively, it's possible the distro added the first user account to wheel also. No, it's not. Otherwise, you can override the the USER setting by giving the -u USER flag to docker run. Fixes are provided only to the supported Alpine Linux Docker image versions 3.6, 3.7, 3.8 and 3.9. Does this command work on CentOS based docker? FTA: On every distro in the past, id do sudo passwd. You've discovered the charming little fact that the registry API will report. I don't trust my enterprise IT department with unencrypted traffic for fear of falling victim to stupid traffic shaping or deep packet inspection intrusion prevention going haywire. E.g. You can look at strlen in the K&R book and it's beautiful, like a textbook: but without tls amazon can "decrypt" your traffic and see whats inside. It falls back to sorting by highest score if no posts are trending. Containers normally do not expose anything else but the target daemon to the network, so cracking in through a non-privileged daemon is unlikely. But sudo access requires you to have logged in through a user in the wheel group. How do you debug in the dev env without a shell? But for those containers you want to deploy, which are based on official base images (such as CentOS, Ubuntu, Debian, etc.) Unless you're behind a load balancer which terminates TLS and the traffic you deal with is purely http. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. > The likelihood of exploitation of this vulnerability is environment-dependent, as successful exploitation requires that an exposed service or application utilise Linux PAM, or some other mechanism which uses the system shadow file as an authentication database. It's not quite as easy to get started as with something like Ubuntu though. Bento theme by Satori. No idea about Alpine. How can the OP change the password when they don't know what it is? Although, in my experience, you can go very far within your vpc. All authentication should be public key based to begin with. The command is "docker exec -it " (command is usually /bin/bash, but you can of course do whatever you want). I will assume you already have Docker up and running. Use Aqua's image assurance policies to verify whether your images have an empty root password. The second field in the root account of the vulnerable Alpine image is empty. Your tech debt may grow slower that way. I don't quite get it. These cookies do not store any personal information. > There being no password also does not matter, as you are by default already running everything as root. This is the part most people don't realise. > Disclaimer: The entry creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE. Alpine Linux is one of the most popular Linux distros on the Docker Hub, with over 10 million downloads. However this is very distinct from the fact that it basically ignores all multi user aspects of Unix when it comes to using the docker command. Years of experience when hiring a car - would a motorbike license count? or you can debug from the host system where the container's pid namespace is a descendant of the root namespace and the other namespaces can be accessed via /proc or unshare. Register for your free TechRepublic membership or if you are already a member, sign in using your preferred method below. For Python in particular, significantly slower. That will update the /etc/hosts/ file without any need to become root. You'd have to use a pretty esoteric platform to get that version. Without a shell, how does one debug if anything goes wrong? Every app built against glibc is going to get bigger, and not all Ubuntu packages are built with small size in mind. Recruiting an Operations Research Analyst with the right combination of technical expertise and experience will require a comprehensive screening process. highly recommended. Amir has 14 cloud and virtual security patents under his belt. This is done with the command: When that command completes (it might have to first pull down the CentOS image), youll find yourself at the bash prompt for the root user. All a container is, is a linux process with added security constraints. It's sloppy writing. You should be able to do this with any of the official Linux distribution images from DockerHub (or any you created on your own). Storage is cheap, but bandwidth may not be. By the time you're going to the trouble of reinventing buildpacks why not just use buildpacks? You're right, they've patched 3.8; I was hitting an older cached image that I had laying around. The 80Mb represents the uncompressed on-disk size. In some cases you need to be able to do things like that under a user with sudo (e.g. Ubuntu used to be much larger so I wouldn't be surprised if people switched to Alpine and never looked back. TechRepublic Premium content helps you solve your toughest IT issues and jump-start your career or next project. > and the traffic you deal with is purely http. Checked it out, is Intel supported with compiler tweaks to get the most out of their CPUs, for libs like math, pandas, etc. To identify whether your image is vulnerable, go to a running Alpine container and execute the following command: A vulnerable container has the following output: The /etc/shadow file stores the users password in an encrypted format. Multiple containers sharing the same parent layers will not require additional storage for the core OS layer. Solution - install busybox-suid (apk add busybox-suid) while being root. Alpine Linux docker images have an empty or null password for the root user when it utilizes shadow or linux-pam packages. The patched container has updated /etc/shadow file to include ! for root user. * most software is written and optimized against glibc, not musl. Create a script that checks for the CVE-2019-5021 vulnerability: if [ $(cat /etc/shadow | grep ^root::) ]; then echo "Image is vulnerable with CVE-2019-5021"; exit 1; else echo "Image is not vulnerable"; exit 0; fi. By default docker containers run as the root user. Which book should I choose to get into the Lisp World? Depends. Per the Date Entry Created this was reported months ago (EDIT: I can't read), although the linked report (. But if I need to debug an issue I'll redeploy them with Ubuntu underneath so I can use the debugging tools. For almost any serious job running in production, you might need CA certificates and openssl. Become root in the official Oracle Database docker container. And the root account can be disabled by updating /etc/passwd file as shown below. }. su: must be suid to work properly. { Simply add this into you Dockerfile: Now under the default image user user you will be able to sudo with the password set on line 3. You dont have to use the full container ID, just the first four characters will suffice. > docker run -it alpine:3.$i head -n 1 /etc/shadow. Removing any instances of "nullok" from any files in /etc/pam.d/ is highly recommended -- unless you explicitly want this behavior (which could be a reasonable choice, in some specific use cases). Docker Security, However, if you plan on doing a lot of in-house development, you certainly dont want to base those containers on images with weak security. Or maybe you dont use libc at all in your fast path? i switched to ubuntu minimal for my cloud instances. Now you'll be able to run sudo level commands from your dev user while inside the container or else you can switch to root inside the container by using the password you set earlier. Inside a container, I'm "dev", but I want to edit the /etc/hosts file. What does the Ariane 5 rocket use to turn? The link from the CVE says "Due to the nature of this issue, systems deployed using affected versions of the Alpine Linux container that utilize Linux PAM, or some other mechanism that uses the system shadow file as an authentication database, may accept a NULL password for the root user." Otherwise folks are fetishising the wrong thing based on a misunderstanding of how container images and runtimes work. For a large cluster it's a wash. You might as well use Ubuntu, Centos -- anything where there are people working fulltime to fix CVEs quickly. The digital transformation required by implementing the industrial Internet of Things (IIoT) is a radical change from business as usual. Many debian based images set this option by default. Technically it's closer to 8. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. As far as I'm aware you'd have to load that 80mb into memory for each docker container you run so that can add up if you want to run a bunch of containers on a cheap host with 1GB of RAM. You would only be affected if you had the shadow package installed (or used PAM in other way). Unsubscribe at any time. Image Vulnerability Scanning, From there you can force the password change of root, commit the container and optionally tag it (with -f) to ubuntu:latest like this: You must rebuild your eventual dependencies on ubuntu:latest. Something might support PAM auth (by accident or intentionally) and it wouldn't allow anything if no/only accounts with strong passwords can be logged into, but obviously breaks once root is available for login. This could have easily led to serious security issues on any container you might have deployed with that pulled image. The issue was initially thought to impact only the Glider Labs Alpine Linux Docker image, but it was later discover to impact the official image as well. I trust myself who setup our infrastructure vs. the security guys who's automatic response to everything is deny all everywhere, encrypt everything everywhere (at rest encryption isn't enough, what can you do to get the db to work on the data encrypted internally 100% of the time? Invalid email/username and password combination supplied. https://github.com/GoogleContainerTools/distroless project gives a way to have these runtimes + their lib dependencies while still maintaining a minimal attack surface. Anyone know the DEFAULT su password for Docker install? You would not even be affected if you installed busybox-suid. If it can't inspect the traffic, it can't do layer 7 routing. The default Ubuntu containers don't even include an init system. It requires root to run the daemon, and to use it you either need sudo or belong to the docker group which is equivalent to root access. Recently folks have done this with One Multibuild To Rule Them All.

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